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Polyester resin and method for preparing the same

a polymer resin and polymer technology, applied in the field of polymer resins, can solve the problems of difficult to enhance the heat resistance of bisphenol-a through stretching or crystallization process, limitations on application and enhancement of heat resistance, etc., and achieve the effect of superior heat resistance and impact strength

Inactive Publication Date: 2012-07-12
SK CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0008]The polyester resin according to the present invention has superior heat-resistance and impact strength because it use 1,4-cyclohexane dimethanol and isosorbide at the same time as diol components.

Problems solved by technology

Recently, in the polycarbonate which has been used as the heat-resisting container for food, harmfulness of bisphenol-A to the human being has been revealed.
However, there are limitations on application and enhancement of heat-resistance.
In the case of polyester which is copolymerized with at least two glycol or terephthalic acid components, there is a disadvantage that it is difficult to enhance heat-resistance thereof by stretching or crystallize process.
According to the results of past studies, isosorbide has low activity as a secondary alcohol so that it is difficult to prepare high viscous polyester which can be used for manufacturing sheets or bottles.
If glass fiber is added, usually impact strength is enhanced, but transparency is extremely lowered and applications are limited due to the harmfulness of glass fiber.

Method used

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  • Polyester resin and method for preparing the same

Examples

Experimental program
Comparison scheme
Effect test

examples 1-6

Preparation of Polyester Resin

[0025]Except for using the amounts of TPA, IPA, ISB, and EG according to Table 1, polyester resin was prepared by the same manner described in Comparative Example 1. Intrinsic viscosity, heat-resistance (Tg) and izod impact strength of the polyester resin were measured, and represented in Table 1.

TABLE 1ExamplesComparative Examples12345612345TPA(%)1001009010010010010010010090100IPA(%)1010ISB(%)9381920401841039200CHDM(%)912242585521000060EG(%)04039225619690618040IV(dl / g)0.660.590.630.690.550.700.740.650.580.630.75Heat-resistance92123104107130102859312410485(Tg, ° C.)Impact9068129N.B3029138373032N.Bstrength(J / m)

[0026]In Example 4 and Comparative Example 5, impact strength could not be measured because any break did not occur (No-Break: N.B) due to high mechanical strength. As shown in Table 1, to compare a conventional polyester resin, the polyester resin according to the present invention has much superior impact strength though it has same or higher hea...

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Abstract

A polyester resin copolymerized with isosorbide and 1,4-cyclohexane dimethanol and having an improved impact strength, and a method for preparing the same are disclosed. The copolymerized polyester resin has an alternating structure of acid moieties which are derived from acid components and diol moieties which are derived from diol components, wherein the acid components comprise terephthalic acid, and the diol components comprise (i) 5˜99 mol % of 1,4-cyclohexanedimethanol and (ii) 1˜60 mol % of isosorbide with respect to the total diol components.

Description

TECHNICAL FIELD[0001]This invention relates to a polyester resin and a method for preparing the same, and more specifically to a polyester resin copolymerized with isosorbide and 1,4-cyclohexane dimethanol and having an improved impact strength, and a method for preparing the same.BACKGROUND ART[0002]The polyester resin has been widely used in fields of the packing materials, the forming products and the films, and is one of the environment-friendly plastics which has no endocrine disruptors. Recently, in the polycarbonate which has been used as the heat-resisting container for food, harmfulness of bisphenol-A to the human being has been revealed. So, the demand for the environment-friendly transparent and heat-resisting polyester resin has more increased. The polyester resin which is copolymerized with at least two glycol or dicarboxylic acid components has been commercially widely used to improve a moldability thereof and to remove a crystallinity thereof. In the case of homopolye...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C08G63/672B32B1/02
CPCC08G63/672Y10T428/1352C08G63/78G06F8/65Y02W90/10C08G63/137C08G63/183C08G2261/63
Inventor LEE, ROYKIM, JONG-RYANGLIM, JAE-BONGYOON, WON-JAEKIM, DONG-JINPARK, JYU-TAELEE, YOO-JIN
Owner SK CHEM CO LTD
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